<template>
    <div class="login_container">
        <div class="login_box">
            <!-- 头像区 -->
            <div class="avarar_box">
                <img src="../assets/logo.png" alt="">
            </div>
            <!-- 登录表单区 -->
             <el-form  ref="loginFormRef" :model="loginForm" :rules="loginFormRules" label-width="0px" class="login_form">
                <!-- 用户名 -->
                <el-form-item prop="username">
                    <el-input v-model="loginForm.username" prefix-icon="iconfont icon-user"/>
                </el-form-item>
                <!-- 用户密码 -->
                <el-form-item prop="password">
                    <el-input v-model="loginForm.password" prefix-icon="iconfont icon-3702mima" type="password"/>
                </el-form-item>
                <!-- 按钮区域 --> 
                <el-form-item class="btns">
                    <el-button type="primary" @click="login">登录</el-button>
                    <el-button type="info" @click="resetLoginForm">重置</el-button>
                </el-form-item>
    
             </el-form>
   
        </div>
    </div>
</template>

<script>
export default {
   data() {
       return {
           // 这是登录表单的数据绑定对象
           loginForm: {
                "username": "admin",
                "password": "123456"
           },
           // 表单验证规则对象
           loginFormRules:{
               //验证用户名是否合法
                username:[
                    {required: true, message:'请输入账号或邮箱',trigger:'blue'},
                    { min: 3, max: 10, message: '长度在 3 到 10 个字符', trigger: 'blur' }

                ],
               // 验证密码是否合法
                password:[
                    {required: true, message:'请输入登录密码',trigger:'blue'},
                    { min: 6, max: 15, message: '长度在 6 到 15 个字符', trigger: 'blur' }
                ]
           }
       }
   },
   methods: {
       // 点击重置按钮，重置登录表单
       resetLoginForm() {
           this.$refs.loginFormRef.resetFields();
       },
       login() {
           this.$refs.loginFormRef.validate(async valid=>{
               if(!valid) return;
               const {data: res}  = await this.$http.post('login',this.loginForm);
               if(res.meta.status !== 200) return this.$message.error('登录失败');
               this.$message.success('登录成功');
                //1、将登录成功后的token，保存到客户端的sessionStorage中
                    //1.1 项目中出现了登录之外的其他API接口，必须登录之后才能访问
                    //1.2 token 只应当在当前网站打开期间生效，所以将 token 保存在 sessionStorage
                window.sessionStorage.setItem('token',res.data.token);
                //2. 通过编程式导航调转到后台主页，路由地址是 /home
                this.$router.push('/home')
           });
       } 
   }
}
</script>

<style lang="less" scoped>
    .login_container{
        background-color: #2b4b6b;
        height: 100%;
    }
    .login_box{
        width:450px;
        height: 300px;
        background-color: #fff;
        border-radius:5px;
        position: absolute;
        left:50%;
        top:50%;
        transform: translate(-50%,-50%);
    }
    .avarar_box{
        height: 130px;
        width: 130px;
        border: 1px solid #eee;
        border-radius: 50%;
        padding: 10px;
        box-shadow: 0 0 7px;
        position: absolute;
        left: 50%;
        transform: translate(-50%,-40%);
        background-color: #fff;
        img {
            width: 100%;
            height: 100%;
            border-radius: 50%;
            background-color: #eee;
        }
    }
    .login_form{
        position: absolute;
        bottom: 0;
        width: 100%;
        padding: 0 30px;
        box-sizing: border-box;
    }
    .btns {
        display: flex;
        justify-content: flex-end;
    }

</style>
